Modern unleaded fuels, most using 5%, (or more) bio-fuel and many other potentially harmful additives (to the fuel system, not the environment!), can play havoc with the carburettor internals.
Failure to drain the carburettor/s for the winter lay up allows the petrol to turn into varnish, clogging up the carburettor jets and coating the float and float chamber, sometimes to the point where it becomes so difficult to clear, replacement of all the various internals may give preferable results?
Other suggestions of carburettor parts, both internal and external, you may require are listed below:
Engine rebuild? Try this pro-workshop gasket sealant: 08C70K0234M. Easy to apply with superb results. Add as many items as you wish to the same shopping cart, nice shiny new screws 0211205107 1360104148 1360444080 & floats 1325005A10 for example, and still only pay the same single fixed price shipping cost. This component may have other applications in the Suzuki model range.